(PHP 4, PHP 5)
round — Rounds a float
$val
[, int $precision = 0
[, int $mode = PHP_ROUND_HALF_UP
]] )
Returns the rounded value of val to
specified precision
(number of digits after the decimal point).
precision can also be negative or zero (default).
Note: PHP doesn't handle strings like "12,300.2" correctly by default. See converting from strings.
valThe value to round
precisionThe optional number of decimal digits to round to.
mode
One of PHP_ROUND_HALF_UP,
PHP_ROUND_HALF_DOWN,
PHP_ROUND_HALF_EVEN, or
PHP_ROUND_HALF_ODD.
The rounded value
Example #1 round() examples
<?php
echo round(3.4); // 3
echo round(3.5); // 4
echo round(3.6); // 4
echo round(3.6, 0); // 4
echo round(1.95583, 2); // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2); // 5.05
echo round(5.055, 2); // 5.06
?>
Example #2 mode examples
<?php
echo round(9.5, 0, PHP_ROUND_HALF_UP); // 10
echo round(9.5, 0, PHP_ROUND_HALF_DOWN); // 9
echo round(9.5, 0, PHP_ROUND_HALF_EVEN); // 10
echo round(9.5, 0, PHP_ROUND_HALF_ODD); // 9
echo round(8.5, 0, PHP_ROUND_HALF_UP); // 9
echo round(8.5, 0, PHP_ROUND_HALF_DOWN); // 8
echo round(8.5, 0, PHP_ROUND_HALF_EVEN); // 8
echo round(8.5, 0, PHP_ROUND_HALF_ODD); // 9
?>
| Version | Description |
|---|---|
| 5.3.0 |
The mode parameter was introduced.
|
| 5.2.7 | The inner workings of round() was changed to conform to the C99 standard. |